7m squre - 84=0 factoization method
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7m^2 - 84 = 0
7 (m^2 - 12) = 0
7 [m^2 - (2√3) ^2] = 0
7 (m + 2√3) (m - 2√3) = 0
m + 2√3 = 0 (or) m - 2√3 = 0
m = - 2√3 (or) m = 2√3
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